The report said a dramatic increase in safety checks following the 2009 rear-end train collision in the Washington, D.C. subway system simply overwhelmed the inspectors.

The D.C. collision killed nine people.

Here in New York, equipment that was supposed to be inspected every 30 days was not being checked until days or even weeks later, if at all. The line most was risk was the L line, whose trains are operated robotically with fewer fail-safes in place.

“It’s scary that no one is checking,” one commuter said.

The MTA said in a statement that it has “changed the leadership of the signals division and took swift action to ensure that none of these deficiencies undermined the signal systems’ safe operation or its underlying components.”

The swift action by the MTA included the demotion of signal department supervisor Tracy Bowdwin and the questioning of others, sources said.

Falsifying an MTA report is a felony offense, but no one has been charged yet as the MTA is still investigating.

Meanwhile, inspectors are now scrambling to conduct new safety checks.